We have a leaking bathtub spout. My husband has replaced both the handles and they appear to have no leaks however the spout even with the water off has running water coming out of the pipe. We got in behind the wall and it is all dry and no leaks. We have replaced the spout head but that does not seem to make a difference. Can anyone provide a suggestion on what this might be from? We are using tape to secure the spout.